The 
mark appears in the sources in different places between the last quaver in bar 70 and the first one in bar 71 (and similarly in bars 74-75). Those differences may derive from the not entirely precise notation of handwritten base texts of first editions, as in Chopin's autographs the notation of pedalling is sometimes ambiguous. For each of the sources we give the most probable interpretation of that detail.
In the main text, similarly as in analogous bars 8-9 and 12-13, we propose a variant solution in each and every situation.
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category imprint: Interpretations within context; Differences between sources; Editorial revisions
notation: Pedalling